【英语语法】状语从句
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状语从句在复合句中,充当状语的从句叫作状语从句,一般修饰谓语动词或整个主句。
状语从句一般可分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句、比较状语从句和方式状语从句等。
一、时间状语从句在复合句中起时间状语作用的从句称为时间状语从句,可放在句首、句中或句尾。
(二)until 和 till的用法1.肯定句:主句的谓语动词必须是延续性动词,主句、从句都为肯定式,意为“直到……为止”;2.否定句:主句的谓语动词必须是非延续性动词,从句为肯定式,表示“某动作直到某时才开始”;3.till 不可以置于句首,而until可以。
例:They waited till / until I returned.他们一直在等我回来。
You may stay here until / till the rain stops.你可以待在这里直到雨停。
He won’t go to bed until / till she returns.直到她回来,他才上床睡觉。
Until you told me I had no idea of it.直到你告诉我,我才知道这件事。
(三)since的用法(四)before的用法一般情况下before表示“在……之前”,有时根据上下文,还可表示“还未……就……” “不到……就……” “……才……” “趁……还未……”等例:Please write it down before you forget it.趁你还没忘,请把它记下来。
I must finish this letter before I go home.我必须在回家之前完成这封信。
Before I could get in a word, he had measured me.我还没来得及插话,他就给我量好了尺寸。
We had sailed four days and four nights before we saw land.我们航行了四天四夜才看到陆地。
状语从句状语从句一什么是状语从句二状语从句位置三状语从句分类四特殊句式五状语从句常见考点六练一练一什么是状语从句状语从句是行使状语功能的从句,因为其作用相当于副词,它可以用来修饰谓语、定语、状语或整个句子。
状语从句通常由一个连接词或起连接词作用的词组引导。
二状语从句位置比较灵活,有时可以放于句首,有时可以置于句末。
状语从句位于句首时,其后常用逗号与后面的句子隔开。
三状语从句分类状语分类常用连接词例句时间状语after,before,when,while,whenever,as soonas,the moment,as,since,until,the minute,the second,immediately,directly,instantly The ball goes up very high after it hits the ground.Wait until you’re called.地点状语where,wherever You can take a walk wherever you liketo.原因状语Because,as,since,now that,seeing(that)considering(that),Since you do not understand,I will explain again.结果状语so that,such that He is so young that he can’t go to work.目的状语so that,in order that Speak clearly so that they mayunderstand you.条件状语if,unless,as(so)long as,once,unless,on condition that,in case He will do anything as long as it is interesting.让步状语though,although,even though,whilewhether,whoever/no matterwho,whatever/no matter what,whenever/ no matter Even though you say so,I do not believe it.比较状语than as…as,the more…the more The more I see him,the less I like him.方式状语as,as if,as though He told me everything as if I were hisbest friend.四特殊句式1时间状语中A:It+be+时间点+when……当某事发生时是什么时候It was11:00PM when he came back last night.B:It is/has been+时间段+since……自从某事发生后已过了多久时间It is/has been two years since I entered the the senior school.C:It+be+时间段+before……在某事发生之前需要多久时间It was8years before we finally drove away the Japanese invaders.It might be a long time before Chinese land on the moon.2让步状语从句A:as引导的让步状语从句,从句的表语、状语必须前置到句首。